Disk shears.



No. 895,895. PATENTBD AUG. 11, 1908.

J. A. SAGERDAHL.

DISK SHEARS. APPLICATION FILED FEB. 21, 1908.

JOHN A. SAGERDAHL, OF YOUNGSVILLE, PENNSYLVANIA.

DISK SHEABS.

Specification of Letters Patent.

Patented Aug. 11, 1908.

Application filed February 21, 1908. Serial No. 117,139.

To all whom it may concern:

Be it known that I, JOHN A. SAGERDAHL,

a citizen of the United States, residing at Youngsville, in the county of Warren and State of Pennsylvania, have invented a new and useful Disk Shears, of which the following is a specification.

This invention relates generally to disk shears, and more particularly to one adapted for cutting paper mirror backs.

The object of the invention is to provide an implement of this character that shall be simple of construction, eflicient and durable in use, easy to operate, and in which the parts will be so constructed and assembled as to reduce liability of breakage in use to a minimum.

With the above and other objects in view, as will appear as the nature of the invention is better understood, the same consists in the novel construction and combination of parts of a disk shear, as will be hereinafter fully described and claimed.

In the accompanying drawings forming a part of this specification, and in which like characters of reference indicate corresponding parts, Figure 1 is a view in perspective of a disk shear constructed in accordance with the present invention. Fig. 2 is a view in side elevation-of a portion of the shear mechanism.

Referring to the drawings, 1 designates the bed or base of the shears, which is supported by standards or legs 2 that are adapted to be bolted or otherwise secured to a bench, or the like. For the purposes of lightness, the bed is shown as a hollow, rectangular structure, and near each end, and preferably at the longitudinal medial line, is arranged a bearing 3, which ispreferably, though not necessarily, integral with the bed. In these two bearings is mounted an arbor 4 one end of which carries a gear wheel 5 and a pulley 6, and the other end of which is reduced and threaded and carries a steel disk 7, which is held detachably assembled with the arbor by a nut 8 that engages the reduced end and constitutes a feed roller or element.

Projecting upward from the bed are four posts or pillars 9 to which are firmly bolted two bearings 10 in which is mounted a second arbor 11, one end of which carries a gear 12 that meshes with the gear 5, and the other end of which is reduced and threaded and carries a disk cutter 13 that is held rigidly assembled with. its carrying arbor by a nut 14 that engages the reduced end. This cutter is adapted to work against the outer side of the feed member 7, as clearly shown.

The gears 5-and 12 are proportioned to each other as two to one, the gear 5 being the larger, whereby to drive the cutting disk twice as fast as the feed member.

In order to support the work in. roper position relatively to the cutter and eed roller, a table is rovided, which comprises two approximate y L-shaped arms 15 and 16 that are bolted at the end of the bed at which the cutter and feed roller are located, and extend upward a suflicient distance to cause the work properly to be operated upon, the said arms being spaced apart a sufficient distance to prevent any interference with the feed roller, and extending outward a distance that will insure a proper supporting surface for the work irrespectlve of its size.

To conserve space, and to prevent the arms from presenting obstructions, each of the latter is constructed of two members hinged together, the horizontal member beand durable, and will result in a rapid and clean cutting of paper backs for mirrors. Heretofore this work has been done with a band saw, and aside from being expensive, owing to the clogging of the saw teeth with the paper and thus delaying the work, the finished product would have rough edges, whereas with the implement forming the subject-matter of this invention, this objectionable feature is entirely obviated.

Where either the cutter or the feed roller is to be removed, it will only be necessary to detach either the nut 14.01 8 for the purpose, so that no appreciable loss of time Wlll ensue where a new cutter or roller has to be substituted for one that has become dulled from use.

I claim A disk shear comprising a bed provided adjacent to each end with a bearing, an arbor mounted within the bearings and carry- When the maing at one end a feed disk and at its other end hinge braces carried by the bed and arranged a relatively large gear and a pulley, posts to hold the tables in horizontal position. rigid With the bed, bearings supported by the In testimony that I claim the foregoing as posts, a second arbor journaled in the last my oWn, I have hereto affixed my signature named bearings and carrying at one end a in the presence of two Witnesses.

relatively small ear meshin With that first Y named and at its other end a cutting disk 00- JOHN SAGERDAHL' acting With the feed disk, two-part folding VVitnes'ses:

arms bolted to one end of the bed, the folding C. H. PETERS,

' 10 members of the arms constituting tables, and l PI 0. WVILGOX. 

